2019 年 36 巻 3 号 p. 147-155
This study aimed to evaluate the degree of variation in abdominal gradient-echo three-dimensional(3D)T1- weighted images(T1-WI)with fat suppression(FS)across various magnetic resonance imaging(MRI)systems and institutions using the same phantom. Phantom studies were performed at seven institutions using a 1.5-T MRI machine and at six institutions using a 3.0-T MRI machine. The FS rate(FSR)and coefficients of variation(CV)were calculated to evaluate uniformity of the phantom [liquid beef tallow(LBT)and saline]. The median FSR was 0.89 and 0.82 using the 1.5-T original(for routine abdominal study)and unified(unified to the extent possible)sequences and 0.91 and 0.91 using the 3.0-T original and unified sequences, respectively. The median %CV for LBT data was 10.06% and 7.99% using the 1.5-T original and unified sequences and 18.21% and 27.06% using the 3.0-T original and unified sequences, respectively. The median FSR and %CV in the central and peripheral regions in LBT data using the 1.5-T original sequence and unified sequences displayed significant differences. Conversely, the median %CV in the data using the 3.0-T original and unified sequences displayed no significant differences. The data obtained in the present multi-institutional study suggest variation in MRI data.